A5086414525- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Space Exploration and Technology
- Astro and Planetary Science
Sun Yat-sen University
2022-2023
Abstract Many young clusters possess extended main sequences, a phenomenon commonly ascribed to stellar rotation. However, the mechanism behind their very wide rotation distributions remains unclear. A proposed explanation is that magnetic star–disk interaction can regulate rotation, i.e., protostars with longer disk lifetimes will eventually evolve into slow rotators, and vice versa. To examine this hypothesis, we took star-forming region NGC 2264, as test bed. We have studied its high-mass...
Abstract Extended main-sequence stars that are dim in the ultraviolet passbands of Hubble Space Telescope (UV-dim stars) found several young and intermediate-age star clusters Magellanic Clouds (MCs). The obscuring dust disks expelled as a result fast rotation has been suggested to be responsible for appearance UV-dim play an important role formation extended main sequences. In this paper, we report population A- F-type show H α emission features their spectra (~340 Myr old) neighboring...
Abstract Research has shown that many young and intermediate-age clusters (younger than ∼2 Gyr) have extended main sequences main-sequence turnoffs (eMSTOs), which cannot be adequately described by a single isochrone. The reason for the is now known, with most probable cause being fast rotation of stars. However, significant fraction slowly rotating stars form younger stellar population their fast-rotating counterparts, leading to speculation they undergone rotational mixing processes...
The detection of split main sequences (MSs) associated with young clusters ($\lesssim$600 Myr) has caught lots attention. A prevailing scenario is that a bimodality stellar rotation distribution drives the MS bifurcation. Nevertheless, origin dichotomy remains unclear. Hypotheses involving tidally-locked binaries or blue straggler stars (BSSs) are proposed to explain observed MSs. This work examines if long-term dynamical evolution star can produce MSs, through high-performance $N$-body...
ABSTRACT The split main sequences found in the colour–magnitude diagrams of star clusters younger than ∼600 Myr are suggested to be caused by dichotomy stellar rotation rates upper main-sequence stars. Tidal interactions have been as a possible explanation rates. This hypothesis proposes that slow stars along tidal binaries. To test this scenario, we measured variations radial velocities slowly rotating sequence young Galactic cluster NGC 2422 (∼90 Myr) using spectra obtained at multiple...
In addition to the extended main-sequence turnoffs widely found in young and intermediate-age (~ 600 Myr-2 Gyr-old) star clusters, some younger clusters even exhibit split main sequences (MSs). Different stellar rotation rates are proposed account for bifurcated MS pattern, with red blue MSs (rMS bMS) populated by fast slowly rotating stars, respectively. Using photometry from Gaia Early Data Release 3, we report a Galactic open cluster MS, NGC 2422 ( ~ 90 Myr). We exclude possibilities that...
Research has shown that many young and intermediate-age clusters (younger than $\sim$2 Gyr) have extended main sequences main-sequence turnoffs (eMSTOs), which cannot be adequately described by a single isochrone. The reason for the is now known, with most probable cause being fast rotation of stars. However, significant fraction slowly rotating stars form younger stellar population their fast-rotating counterparts, leading to speculation they undergone thorough rotational mixing processes...
Many young clusters possess extended main sequences, a phenomenon commonly ascribed to stellar rotation. However, the mechanism behind their very wide rotation distributions remains unclear. A proposed explanation is that magnetic star-disk interaction can regulate rotation, i.e., protostars with longer disk lifetimes will eventually evolve into slow rotators, and vice versa. To examine this hypothesis, we took star forming region, NGC 2264, as test bed. We have studied its high-mass...
Extended main-sequence stars that are dim in the ultraviolet passbands of Hubble Space Telescope (UV-dim stars) found several young and intermediate-age Magellanic Cloud star clusters. The obscuring dust discs expelled due to fast rotation have been suggested be responsible for appearance UV-dim stars, play an important role formation extended main-sequences. In this paper, we report a population A- F-type who show H{\alpha} emission features their spectra (~ 340 Myr-old) Galactic...
The detection of split main sequences (MSs) associated with young clusters ($\lesssim$600 Myr) has caught lots attention. A prevailing scenario is that a bimodality stellar rotation distribution drives the MS bifurcation. Nevertheless, origin dichotomy remains unclear. Hypotheses involving tidally-locked binaries or blue straggler stars (BSSs) are proposed to explain observed MSs. This work examines if long-term dynamical evolution star can produce MSs, through high-performance $N$-body...
The split main sequences found in the colour-magnitude diagrams of star clusters younger than ~600 Myr are suggested to be caused by dichotomy stellar rotation rates upper main-sequence stars. Tidal interactions have been as a possible explanation rates. This hypothesis proposes that slow stars along tidal binaries. To test this scenario, we measured variations radial velocities slowly rotating sequence young Galactic cluster NGC 2422 (~90 Myr) using spectra obtained at multiple epochs with...
In addition to the extended main-sequence turnoffs widely found in young and intermediate-age (~ 600 Myr-2 Gyr-old) star clusters, some younger clusters even exhibit split main sequences (MSs). Different stellar rotation rates are proposed account for bifurcated MS pattern, with red blue MSs (rMS bMS) populated by fast slowly rotating stars, respectively. Using photometry from Gaia Early Data Release 3, we report a Galactic open cluster MS, NGC 2422 ( ~ 90 Myr). We exclude possibilities that...